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The photolysis of ethylene carbonate and vinylene carbonate in the gas phase

Authors
Journal
Journal of Photochemistry
0047-2670
Publisher
Elsevier
Publication Date
Volume
21
Issue
1
Identifiers
DOI: 10.1016/0047-2670(83)80001-x
Disciplines
  • Physics

Abstract

Abstract The photolysis of ethylene carbonate vapour was studied at 206.2 nm at pressures from about 5 to 30 Torr and at temperatures from 120 at 160 °C. The major products were CO 2 and ethylene oxide, while the minor products were H 2, CO, CH 4 and CH 3CHO. The quantum yields for the production of CO 2 increased sharply at higher pressures, reaching values as high as 200, and there is evidently an unusual photo-initiated chain reaction occurring to produce CO 2, ethylene oxide polymer and smaller amounts of ethylene oxide. The thermal decomposition was also studied briefly between 150 and 500 °C; CO 2 and ethylene oxide were major products, apparently formed in a surface reaction. The photolysis of vinylene carbonate vapour around 220 – 240 nm at pressures from 1 to 5 Torr and a temperature of 60 °C gave CO and H 2 as the major products in a 3 to 1 ratio. Ketene and CO 2 were also observed in rather smaller yields. Mechanisms are discussed and absorption spectra are reported for both compounds.

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